Here's the NFL.com draft analysis on Thomas:
Draft Projection
Rounds 5-6
Overview
Tackle-to-guard prospect with run-blocking talent to work with, Thomas is a fit for zone-scheme teams as a sticky move blocker with the ability to shift and stay connected while continuing to keep his feet moving. He lacks the desired mass and power to generate much downhill push, but improved hand placement could help. His play strength, in general, needs an upgrade, as does his protection posture, to prevent defenders from exploiting certain flaws. Thomas has late-round potential and could find a place on an NFL roster as a guard with emergency tackle flexibility.
Strengths
-Broad across his upper body, with room for more muscle.
-Comes off the snap with excellent pad level.
-Stays low and fits into blocks with leverage.
-Engages and runs feet through the whistle.
-Athleticism and body control to stay connected to the block.
-Active feet to mirror the rush.
-Feints punch to create a reaction.
-Brings feet with him through protection redirection.
Weaknesses
-Lacks explosiveness into contact.
-Doesn't generate much pop getting into down blocks.
-Hand placement can get away from him.
-Needs to do a better job of resetting hands when he gets behind.
-Plays with lunge when climbing up to linebackers.
-Punch gets timed and swatted by defenders.
-Needs to maintain a flat-back protection posture.
-More rigid punch to firm up edges is required.